On giovedì 26 aprile 2007, Herbert Volkmann wrote: > Hi List, > > i ran in the following problem: Very strange... > when i produce files (with dd) or copy files to or from the uml machine, Which filesystems are involved? Can you give a sample command?
> i can see (with top), Run on the guest (i.e. UML) I guess, right? > that the used memory and the cached things > increases, while the unused memory will go down. That is reasonable, but the cache should not make the system stop. > shortly before memory > will come to zero, the uml stops working completely without any messages > in the /var/log/* files on uml or host system. > > if i do in between a "echo 3 > /proc/sys/vm/drop_caches" On the guest (i.e. UML) I assume, right? > > it cleans caches, frees memory and works fine! but i have to do this all > 10 seconds when i use dd for producing large files ;-( > > these are the components i use: > - debian etch on host with debian kernel patched with skas3 from debian 32bit system, right? > - 1024 MB RAM on host > - RAID5 System with 3ware Controller (5x2G) almost 1 TB > - on uml i use debian etch, with bridged networking, 512MB RAM for uml Which UML kernel release? That's the most important thing. > - 6G root_fs for uml and 256M swap > > here is the command with which i start the uml: > sudo -u uml /usr/bin/linux.uml umid=uml mem=512M eth0=tuntap,tap1 > ubd0=/usr/media/uml-linux/root_fs_2007_04_23 > ubd1=/usr/media/uml-linux/swap_fs con=null root=/dev/ubda uml_dir=/tmp/ > > I would be really happy if someone could tell me what i can test more to > find out why this system is instable with i/o operations and caches. I have only a doubt: if you are filling a shmfs/tmpfs filesystem (which is backed by ram), that's an almost normal behaviour, and can happen even on host systems. > thanx for any reply, > Herbert -- Inform me of my mistakes, so I can add them to my list! Paolo Giarrusso, aka Blaisorblade http://www.user-mode-linux.org/~blaisorblade ------------------------------------------------------------------------- This SF.net email is sponsored by DB2 Express Download DB2 Express C - the FREE version of DB2 express and take control of your XML. No limits. Just data. Click to get it now. http://sourceforge.net/powerbar/db2/ _______________________________________________ User-mode-linux-devel mailing list User-mode-linux-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/user-mode-linux-devel
